Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period Type:	duration

Commitments and Contingencies - Additional Information (Detail) - DST Systems Inc [Member] - USD ($) $ in Millions	Jul. 10, 2020	Sep. 30, 2021
Other (expense) income [Member]
Loss Contingencies [Line Items]
Accrued liability and expense		$ 43.4
Settled Litigation [Member] \| Putative Claims [Member]
Loss Contingencies [Line Items]
Litigation settlement, expense	$ 27.0